Wang Haozhe, Zhou Haidong, Xie Weiwei
Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States.
Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, United States.
Inorg Chem. 2025 Jan 20;64(2):828-834. doi: 10.1021/acs.inorgchem.4c03042. Epub 2025 Jan 10.
A recent article ( 2024, 146, 7506-7514) details a pressure-temperature (-) phase diagram for the Ruddlesden-Popper bilayer nickelate LaNiO (LNO-2222) using synchrotron X-ray diffraction. This study identifies a phase transition from (#63) to (#69) within the temperature range of 104-120 K under initial pressure and attributes the 4/ (#139) space group to the structure responsible for the superconductivity of LNO-2222. Herein, we examine the temperature-dependent structural evolution of LNO-2222 single crystals at ambient pressure. Contrary to the symmetry increase and the established - phase boundary, we observe an enhancement in the reflections as temperature decreases. This work not only delivers high-quality crystallographic data of LNO-2222 using laboratory X-rays across various temperatures but also enhances the understanding of the complex crystallographic behavior of this system, contributing insights to further experimental and theoretical explorations.
最近的一篇文章（2024年，第146卷，7506 - 7514页）详细介绍了使用同步加速器X射线衍射得到的鲁德尔斯登 - 波珀双层镍酸盐LaNiO（LNO - 2222）的压力 - 温度（-）相图。该研究确定了在初始压力下，LNO - 2222在104 - 120 K的温度范围内从（#63）相到（#69）相的相变，并将4/（#139）空间群归因于负责LNO - 2222超导性的结构。在此，我们研究了常压下LNO - 2222单晶随温度变化的结构演变。与对称性增加和既定的 - 相边界相反，我们观察到随着温度降低， 反射增强。这项工作不仅使用实验室X射线在不同温度下提供了LNO - 2222的高质量晶体学数据，还增进了对该系统复杂晶体学行为的理解，为进一步的实验和理论探索提供了见解。
